This sign indicates the proximity of a danger due to...
Signage: Vertical signs
Explanation
P-17B: Narrowing of the carriageway on the left
- Warning sign (triangular with red border) that warns of a **narrowing of the carriageway** on the **left-hand side**.
- It means that the left-hand lane or verge narrows or disappears.
- How to act: **reduce your speed**, exercise **caution**, and **move to the available lane** only when it is **safe** and **traffic allows**. You may need to **give way** to facilitate the manoeuvre.
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